<!DOCTYPE html>
<title>Upload Form</title>
<script>
  var intervalId;
  function onTick() {
    var label = document.getElementById('upload_label');
    label.innerHTML += '.';
  }

  function onUploadSubmit() {
    document.getElementById('upload_target').contentWindow.document.body.
        innerHTML = '';
    var label = document.getElementById('upload_label');
    label.innerHTML = 'Uploading "' + document.forms[0].upload.value + '"';
    label.style.display = '';
    intervalId = window.setInterval(onTick, 500);
    return true;
  }

  function onUploadDone() {
    var label = document.getElementById('upload_label');
    label.style.display = 'none';
    window.clearInterval(intervalId);
    return true;
  }
</script>
<form action="/common/uploadmult" method="post" name="upload_form"
      target="upload_target" enctype="multipart/form-data"
      onsubmit="onUploadSubmit();">
  <div>
    Enter a file to upload:
    <div><input id="upload" name="upload" type="file" multiple/></div>
    <div><input id="go" type="submit" value="Go!"/></div>
  </div>
  <div id="upload_label" style="display:none"></div>
  <iframe src="" id="upload_target" name="upload_target"
          style="width:300px;height:200px">
  </iframe>
</form>
